<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <input type="text" :value="message" @input="changeValue">
    <input type="text" v-model="message">
    <h2>{{message}}</h2>
</div>


<script src="../../js/vue.js"></script>

<script>
    const vue = new Vue({
        el: "#app",
        data: {
            message: "Hello vue,你好！"
        },
        methods: {
            changeValue(event){
                this.message = event.target.value;
            }
        }
    });
</script>
</body>
</html>